Nissan 370Z Forum  

more understeer with aftermarket tires?

can a car's balance be affected by changing tire compound? this year i ditched the stock tires and replaced them with yokohama advan neova ad08 of the same size as

Go Back   Nissan 370Z Forum > Nissan 370Z General Area > Nissan 370Z General Discussions


Reply
 
LinkBack Thread Tools Display Modes
Old 06-15-2011, 05:52 PM   #1 (permalink)
A True Z Fanatic
 
Pharmacist's Avatar
 
Join Date: May 2009
Location: Toronto, Ontario
Posts: 1,249
Drives: 09 370z Sport 6MT
Rep Power: 18
Pharmacist is a jewel in the roughPharmacist is a jewel in the roughPharmacist is a jewel in the rough
Default more understeer with aftermarket tires?

can a car's balance be affected by changing tire compound? this year i ditched the stock tires and replaced them with yokohama advan neova ad08 of the same size as the stock. i've done a couple of track days on them and i noticed, apart from the increased traction and mechanical grip, is that it seems the handling dynamics of the car changed. last year the car basically had a bit of understeer, but can easily kick the tail out with a bit of throttle. I even spun out a few times while exiting corners. This year on the new tires it seems the car understeers almost as much as a fwd car. The front tires would be squealing throughout the turn. Giving it a bit of throttle doesn't seem to break the rear loose. It's as if the rear tires have much more grip than the front. I haven't messed with the suspension at all, so that shouldn't have an effect. Can different tires really cause more understeer or is it just my imagination???????
__________________
2009 370z Sport Touring/Nismo shift Knob/Z1 motorsports 34 row oil cooler
Pharmacist is offline   Reply With Quote
Old 06-15-2011, 07:14 PM   #2 (permalink)
Track Member
 
Join Date: Mar 2009
Location: Singapore
Posts: 861
Drives: 370z,Yellow,7sp A
Rep Power: 17
Chan Chee Hoe is on a distinguished road
Default

Maybe the grips of AD-08 is not as good as the RE050.??
Chan Chee Hoe is offline   Reply With Quote
Old 06-15-2011, 08:07 PM   #3 (permalink)
The370Z.com Sponsor
 
vividracing's Avatar
 
Join Date: Jun 2009
Location: Gilbert, AZ
Age: 38
Posts: 7,306
Drives: 350Z,370Z,GTR
Rep Power: 39
vividracing has a reputation beyond reputevividracing has a reputation beyond reputevividracing has a reputation beyond reputevividracing has a reputation beyond reputevividracing has a reputation beyond reputevividracing has a reputation beyond reputevividracing has a reputation beyond reputevividracing has a reputation beyond reputevividracing has a reputation beyond reputevividracing has a reputation beyond reputevividracing has a reputation beyond repute
Send a message via AIM to vividracing
Default

Absolutely tires will change many aspects of your cars handling. From the compound, to the tread pattern and everything in between. If you are going to be tracking your car you have to pick your tires very carefully.
__________________

Rocky @ Vivid ♦ 480.966.3040 x236 ♦ Rocky@vividracing.com
Email, PM, or call me directly for aggressive The370Z.com member pricing!!!
vividracing is offline   Reply With Quote
Old 06-15-2011, 08:40 PM   #4 (permalink)
A True Z Fanatic
 
Zaggeron's Avatar
 
Join Date: Jan 2010
Location: Austin, TX
Posts: 1,951
Drives: '10 370ZR '13 BRZ
Rep Power: 18
Zaggeron is a jewel in the roughZaggeron is a jewel in the roughZaggeron is a jewel in the rough
Default

If the grip increased as you said, the understeer you report would not be unusual. Consider: If on your old tires you were losing grip front and rear, then applying throttle could swing the rear around a bit as your report. Now since the grip threshold is higher, when you notice the understeer, the rears still have some grip and it is harder to kick the back around. It may not be the case that the ratio of front to rear grip has changed, rather you are noticing the understeer while the rears still have some grip.

With these new tires you may have to change your entry a bit. You could enter a little slower and the increased grip would allow you to throttle up earlier on corner exit. Or you could come in hotter and try and recreate the situation where your rears are loose enough to kick it around a bit.

In any event what's important are your lap times -- understeer or not how do your lap times compare to those with the stock tires?
__________________
2010 Platinum Graphite 370z Roadster:Touring/Sport
2013 Subaru BRZ Limited
Zaggeron is offline   Reply With Quote
Old 06-18-2011, 12:08 AM   #5 (permalink)
Enthusiast Member
 
Join Date: Dec 2009
Location: secret
Posts: 267
Drives: 370Z, Ducati 748S
Rep Power: 15
BrianMSmith will become famous soon enoughBrianMSmith will become famous soon enough
Default

Yes, tires do have a big effect on a car. Different sizing front to rear on our cars is a big contributor. The tire contributes a huge amount to the overall damping of the suspension, which effects tire loading and therefore traction. Try lowering your front tire pressure, which will increase loading on the front tire, and typically helps understeer. You could also try an alignment adjustment, add some -camber to the front.
BrianMSmith is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
too much understeer now! vortrex Brakes & Suspension 50 12-08-2010 02:05 AM
Aftermarket Sways and Aftermarket Exhaust Endgame Brakes & Suspension 5 10-29-2010 06:27 PM
stock tires, aftermarket wheel pics? ddvette9 Wheels & Tires 0 09-19-2010 03:31 PM
Can I fix understeer without killing ride quality? gozfast Brakes & Suspension 2 08-06-2010 09:04 AM
Aftermarket 18's, Stock Tires? ddvette9 Wheels & Tires 4 09-16-2009 02:46 PM


All times are GMT -5. The time now is 06:18 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2